Pump for liquids at high temperatures



Dec. 1924. 1,517,898

. L; s. o. A. FIEDLER PUMP FOR LIQUIDS AT HIGH TEMPERATURES Filed Dec.14, 1923 Se'bastien 0M0 Alfred Fiedler INVENTOR',

Patented Dec. 2, 1924.

1,5175 FFI,

SEBASTIEN OTTO ALFRED FIEDLEB, OF PARTS, FRANCE, ASSIGNOE TO LAUXILIAIREDES CHEMINS DE FER ET DE LINDUSTRIE, OF PARIS, FRANCE.

PUMP FOR LIQUIDS AT HIGH TEMPERATURES.

Application filed. December 14, 1923. Serial No. 680,625.

To all whom it may concern:

Be it known that I, Sneasrmn O'r'ro ALFRED FIEDLER, citizen of theFrench Republic, residing at Paris, in the French Lepublic, haveinvented new and useful 1mprovements in Pumps for Liquids at HighTemperatures, of which the following is a specification.

It is well known that the pumps for liquids at high temperatures andparticularly pumps for hot water, operate in a somewhat uncertainmanner, since during the suction stroke of the pump a depression isproduced above the liquid, which causes the more or less importantformation of vapour. This vapour is then evacuated during the dischargestroke, but if there is a sutficient quantity thereof, steam pockets are1 produced in the pipes, the drawbacks of the same being also wellknown. The present invention has for its object an improvement in pumpsfor liquids at high temperatures, and 1s more particularly 111- tendedfor pumps working in synchronism with another pump used to handle thesame liquid but at a lower temperature, this improvement consisting inconnecting by piping each chamber of the pump used to handle the liquidathigh temperature respectively with the analogous chamber of the pumpused to handle the same liquid at a lower temperature and working insynchronism with the first pump, two valves opening in oppositedirections being disposed in each of the two connecting pipes.

This arrangement permits the vapour produced by the suction of the pumphandling the high temperature liquid to be condensed in the liquidhandled by the pump used for the same liquid but at a lower temperature,and this ensures a regular working of the said pump when it operateswith liquids even at very high temperatures.

The appended drawing shows by way of example, diagrammatically and insection, an improved tandem pump according to the invention, onecylinder being represented as operating with a liquid heated very nearthe boiling point and the other operating with the same liquid but at amuch lower temperature, one of the end positions of the two pistonscoupled together being shown in full and dotted lines.

In the form of construction shown in the drawing, 1 is the cylinder usedto withdraw pression, and this liquid is cold water in the 1 case inwhich the cylinder 1 operates with hot water. I

Two pistons 3 and 41 reciprocate respec-. tively within the cylinders 1and 2; the two pistons are connected together by the rod 5 and areactuated at the same time by the rod 6. The cylinder 1 has at 7 and 7the admission orifices for hot water and at 8 and 8 the dischargeorifices for this water. The

cylinder 2 has at 9 and 9 the orifices of admission for cold water andat 10 and 10*- the discharge'orifices.

' The chamber 11 of the cylinder 1 is connected with the analogouschamber 12 of the cylinder 2 my means of the piping 18. In

like manner the analogous chambers 14 and 15 of the two cylinders areconnected by means of a second piping 16. Avalve box 17 is mounted onthe pipe 13. This box contains two clack valves 18 and 19 which open incontrary directions and bear respectively upon the seats 18 and 19 Avalve box 20 similar to the box 17 is disposed in the pipe 16. This boxcontains the clack valves 21 and 22 which open in contrary directionsand bear upon their seats 21 and 22.

The operation of the tandem pump thus constituted is as follows. Thepistons. 3 and 4 are supposed to start from their left hand dead centre(position in full lines in the drawing) and move to the right in thedirection of the arrow 23. A suction of hot water thus takes place inthe chamber 11 of the cylinder 1 through the orifice 7 and a suction ofcold water takes place in the chamber 12 of the cylinder 2 through theorifice 9. The chambers 14: and 15 are on the contrary working on thedischarge stroke.

By the efi'ect of the depression produced by the suction in the chamber11, the clack valve 19 will fall by its own weight and will hence leaveits seat 19. water will thus produce a certain vaporization, and thetension of the nascent vapour, added to the suction produced in thecham- The suction of hot ber 12, Will lift the valve 18 from its seat18. The vapour thus produced can there fore pass through the pipe 13 andcondense in the cold water which is entering the chamber 12 of thecylinder 2. The chamber 11 will thus become filled only with hot water,all the vapour which would tend to be produced being condensed, asstated, and the depression in the chamber 11 resulting from thiscondensation will increase the speed of admission of hot water into thesaid chamber 11, thus ensuring the filling in a complete manner. Duringthis movement of the pistons 2-3 and l in the direction of the arrow 23,the hot water previously a-d.- mitted into the chamber 14 and the coldwater admitted into the chamber 15 are discharged respectively through 8and 10 The pressure prevailing in these chambers Will bring the valves21 and 22 upon their seats 21 and 22, thus peventing all communicationbetween these chambers.

During the return stroke of the pistons 3 and 1, the valves 21 and 22will afford passage for the vapour given off during the suction of thehot water into the chamber 14, which vapour will condense in the chamber15. The valves 18 and 19 will on the contrary be brought upon theirseats, thus cutting off all communication between the chambers 11 and 12which are operating by discharge.

These effects will be produced indefinitely in like manner.

Obviously, various constructional modifications may be brought to thedevice above described Without departing from the spirit of theinvention. One has chiefly consid ered the application to water pumps,but obviously the invention is applicable to pumps used to convey anyliquids at high temperatures.

Having now described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A pump installation comprising a pump for liquid at a hightemperature, a pump for the same liquid at a lower temperature, meansfor operating said pumps in synehronism and means for connecting thesuction chamber of one pump with the suction chamber of the other pumpduring the suction stroke.

2. A pump installation comprising a pump for liquid at a highten'iperature, a pump for the same liquid at a lower temperature, meansfor operating said pumps in synchronism, a pipe connecting the suctionchamber of one pump with the suction chamber of the other pump, a valvebox on said pipe and two valves in said valve box, both valves beingadapted to open in opposite directions during the suction stroke.

3. A pump installation comprising a double acting pump for liquid at ahigh temperature, a double acting pump for the same liquid at a lowertemperature, means for operating said pumps in synchronism, pipesconnecting the synchronously working suction chambers of the two pumpsand valve boxes respectively provided on said pipes, each valve boxembodying two valves adapted to open in opposite directions when thecorresponding suction chambers of the pumps are operating on suctionstroke.

In testimony whereof I have signed my name to this specification.

SEBASTIEN QTTO ALFRED FIEDLER.

